Iran criticized on Monday a reported plan by major powers to demand the closure of a uranium enrichment plant in return for an easing of sanctions on Tehran’s trade in gold and other precious metals, Iranian media reported.

The Islamic Republic, which says its nuclear program is peaceful, started building the Fordow plant inside a mountain in secret as early as 2006, to protect it from air strikes.

Last week Reuters reported world powers were planning to offer to ease sanctions barring trade in gold and other precious metals with Iran in return for steps to shut down Fordow.